Exhibit 12.4

Ameren Energy Generating Company

Computation of Ratio of Earnings to Fixed Charges

(Thousands of Dollars, Except Ratios)



|                                                                  |  |                         |         |      |   |         |      |  |      |         |  |      |         |     |  |   |         |    
|----------------------------------------------------------------- |  | ----------------------- | ------- | ---- | - | ------- | ---- |  | ---- | ------- |  | ---- | ------- | --- |  | - | ------- | ---
|                                                                  |  | Year Ended December 31, |        
|                                                                  |  | 2004                    |         | 2005 |   |         | 2006 |  | 2007 |         |  | 2008 |        
|Net income from continuing operations                             |  | $                       | 107,292 |      | $ | 96,732  |      |  | $    | 48,929  |  | $    | 124,894 |     |  | $ | 175,450 |    
|Less- Change in accounting principle                              |  |                         |        |      |   | (15,600 | )    |  |      |        |  |      |        |     |  |   |        |    
|Add- Taxes based on income                                        |  |                         | 64,245  |      |   | 72,433  |      |  |      | 21,955  |  |      | 77,799  |     |  |   | 100,005 |    
|                                                                  |  |                         |         |      |   |         |      |  |      |         |  |      |         |     |  |   |         |    
|Net income before income taxes and change in accounting principle |  |                         | 171,537 |      |   | 184,765 |      |  |      | 70,884  |  |      | 202,693 |     |  |   | 275,455 |    
|Add- fixed charges:                                               |  |                         |         |      |   |         |      |  |      |         |  |      |         |     |  |   |         |    
|Interest on long term debt                                        |  |                         | 93,118  |      |   | 71,720  |      |  |      | 59,070  |  |      | 54,783  | (1) |  |   | 54,153  | (1)
|Estimated interest cost within rental expense                     |  |                         |        |      |   |        |      |  |      | 107     |  |      | 164     |     |  |   | 228     |    
|Amortization of net debt premium, discount, and expenses          |  |                         | 1,497   |      |   | 1,345   |      |  |      | 586     |  |      | 586     |     |  |   | 760     |    
|                                                                  |  |                         |         |      |   |         |      |  |      |         |  |      |         |     |  |   |         |    
|Total fixed charges                                               |  |                         | 94,615  |      |   | 73,065  |      |  |      | 59,763  |  |      | 55,533  |     |  |   | 55,141  |    
|                                                                  |  |                         |         |      |   |         |      |  |      |         |  |      |         |     |  |   |         |    
|Earnings available for fixed charges                              |  | $                       | 266,152 |      | $ | 257,830 |      |  | $    | 130,647 |  | $    | 258,226 |     |  | $ | 330,596 |    
|                                                                  |  |                         |         |      |   |         |      |  |      |         |  |      |         |     |  |   |         |    
|Ratio of earnings to fixed charges                                |  |                         | 2.81    |      |   | 3.52    |      |  |      | 2.18    |  |      | 4.64    |     |  |   | 5.99    |    
|                                                                  |  |                         |         |      |   |         |      |  |      |         |  |      |         |     |  |   |         |    

(1)Includes FIN 48 interest expense